Red LED 3mm Diffused — General Purpose, 10-Pack

Red LED 3mm Diffused — General Purpose, 10-Pack for Arduino, Breadboard & Compact PCB Projects

The 3mm diffused red LED is the compact general-purpose red indicator LED for Arduino, breadboard, and space-constrained PCB projects. At 3mm diameter, this LED fits into tight PCB layouts and compact enclosures where standard 5mm LEDs are too large — making it the preferred choice for miniature electronics, wearable projects, and any application where a small footprint is essential.

Red LEDs have the lowest forward voltage of all common LED colors (typically 1.8–2.2V), making them the most efficient and easiest to drive from low-voltage circuits. The diffused lens provides a wide viewing angle for omnidirectional visibility. Supplied in a 10-pack for prototyping and small production runs.

Key Features

• 3mm through-hole package — compact size for space-constrained PCB layouts
• Diffused lens — wide viewing angle (~120°) for omnidirectional visibility
• Red color — universal stop/error/alert indicator color
• Low forward voltage ~1.8–2.2V — easy to drive from 3.3V and 5V circuits
• 10-pack — ideal for prototyping and small production runs

How to Use with Arduino

• Connect the anode (longer leg) to an Arduino digital output pin through a 220–330Ω current-limiting resistor
• Connect the cathode (shorter leg) to GND
• Set the digital pin HIGH to turn the LED on, LOW to turn it off

Typical Applications

• Error and alert indicators — red is the universal stop/error/fault indicator color
• Compact PCB status indicators — power, fault, and mode indicators on miniature PCBs
• Wearable electronics — small LED indicators for wearable and portable devices
• Arduino beginner projects — compact LED for breadboard and shield projects
• Robotics and automation — fault and status indicator LEDs
• Educational electronics kits — STEM and electronics learning projects

Technical Specifications

• Size: 3mm (T-1)
• Color: Red
• Lens: Diffused
• Forward Voltage (Vf): ~1.8–2.2V
• Forward Current (If): 20mA (typical)
• Viewing Angle: ~120° (diffused)
• Package: Through-hole, 2-pin
• Quantity: 10 per pack
• Brand: Keszoox
• Origin: Mainland China

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